1.The human brain controls many functions.
The diagram shows a section through a human brain with parts labelled A to E
(a) Which letter labels the part of the brain that controls heart rate?
2. Antibiotics can affect bacteria. The table describes the mode of action of four antibiotics.
Antibiotic & Mode of action
- benzylpenicillin - disrupts peptidoglycan structure
- streptomycin binds to 70S ribosomes
- ciprofloxacin - inhibits enzymes involved in prokaryotic DNA replication
- rifamycin - inhibits prokaryotic RNA polymerase
(i) Name the antibiotic that affects Gram-positive bacteria only.---
(ii) Give one reason why these antibiotics will not affect human cells.
Answer
1. E (Human Brain Structure and function)
2. i) benzylpenicillin
ii) human cells are (eukaryotic / lack cell wall/lack peptidoglycan) . human cells have different {ribosomes / enzymes}
Learn more: Mode action of Antibiotics
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Edexcel A Level Biology